--- /dev/null	2016-12-07 23:02:43.000000000 -0800
+++ new/jdk/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/LegalNoticeFilePlugin.java	2016-12-07 23:02:42.000000000 -0800
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.tools.jlink.internal.plugins;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+import jdk.tools.jlink.internal.ModuleSorter;
+import jdk.tools.jlink.internal.Utils;
+import jdk.tools.jlink.plugin.Plugin;
+import jdk.tools.jlink.plugin.PluginException;
+import jdk.tools.jlink.plugin.ResourcePool;
+import jdk.tools.jlink.plugin.ResourcePoolBuilder;
+import jdk.tools.jlink.plugin.ResourcePoolEntry;
+import jdk.tools.jlink.plugin.ResourcePoolEntry.Type;
+import jdk.tools.jlink.plugin.ResourcePoolModule;
+
+/**
+ * A plugin to de-duplicate the legal notices from JMOD files.
+ *
+ * For a de-duplicated legal notice, the actual copy will be in
+ * the base module and with symbolic links in other modules.
+ * On platform that does not support symbolic links, a file
+ * will be created to contain the path to the linked target.
+ */
+public final class LegalNoticeFilePlugin implements Plugin {
+
+    private static final String NAME = "dedup-legal-notices";
+    private static final String ERROR_IF_NOT_SAME_CONTENT = "error-if-not-same-content";
+    private final Map<String, List<ResourcePoolEntry>> licenseOrNotice =
+        new HashMap<>();
+
+    private boolean errorIfNotSameContent = false;
+
+    @Override
+    public String getName() {
+        return NAME;
+    }
+
+    @Override
+    public Set<State> getState() {
+        return EnumSet.of(State.AUTO_ENABLED, State.FUNCTIONAL);
+    }
+
+    @Override
+    public void configure(Map<String, String> config) {
+        String arg = config.get(NAME);
+        if (arg != null) {
+            if (arg.equals(ERROR_IF_NOT_SAME_CONTENT)) {
+                errorIfNotSameContent = true;
+            } else {
+                throw new IllegalArgumentException(NAME + ": " + arg);
+            }
+        }
+    }
+
+    @Override
+    public ResourcePool transform(ResourcePool in, ResourcePoolBuilder out) {
+        // Sort modules in the topological order
+        // process all legal notices/licenses entries
+        new ModuleSorter(in.moduleView())
+            .sorted()
+            .flatMap(ResourcePoolModule::entries)
+            .filter(entry -> entry.type() == Type.LEGAL_NOTICE)
+            .forEach(this::dedupLegalNoticeEntry);
+
+        in.entries()
+            .filter(entry -> entry.type() != Type.LEGAL_NOTICE)
+            .forEach(out::add);
+
+        licenseOrNotice.values().stream()
+            .flatMap(List::stream)
+            .forEach(out::add);
+        return out.build();
+    }
+
+    private void dedupLegalNoticeEntry(ResourcePoolEntry entry) {
+        Path path = Utils.getJRTFSPath(entry.path());
+        Path filename = path.getFileName();
+
+        List<ResourcePoolEntry> entries =
+            licenseOrNotice.computeIfAbsent(filename.toString(), _k -> new ArrayList<>());
+
+        Optional<ResourcePoolEntry> otarget = entries.stream()
+            .filter(e -> e.linkedTarget() == null)
+            .filter(e -> Arrays.equals(e.contentBytes(), entry.contentBytes()))
+            .findFirst();
+        if (!otarget.isPresent()) {
+            if (errorIfNotSameContent) {
+                // all legal notices of the same file name are expected
+                // to contain the same content
+                Optional<ResourcePoolEntry> ores =
+                    entries.stream().filter(e -> e.linkedTarget() == null)
+                           .findAny();
+
+                if (ores.isPresent()) {
+                    throw new PluginException(ores.get().path() + " " +
+                        entry.path() + " contain different content");
+                }
+            }
+            entries.add(entry);
+        } else {
+            entries.add(ResourcePoolEntry.createSymLink(entry.path(),
+                                                        entry.type(),
+                                                        otarget.get()));
+        }
+    }
+
+    @Override
+    public Category getType() {
+        return Category.TRANSFORMER;
+    }
+
+    @Override
+    public String getDescription() {
+        return PluginsResourceBundle.getDescription(NAME);
+    }
+
+    @Override
+    public boolean hasArguments() {
+        return true;
+    }
+
+    @Override
+    public String getArgumentsDescription() {
+        return PluginsResourceBundle.getArgument(NAME);
+    }
+}